To sovle the problem改成Sovling the problem会更好;
regulations to educate those student 中student要改成复数students;
who don’t throw rubbish away中don’t 删除,不然意思刚好相反;
On the other hand最好删除或者改成Additional,因为前文没有On one hand相呼应;
is waiting for us when all the measures 中when最好改成if;
第二段but also后的it删去
believe high time
belivev ?????